NV2A/Vertex Shader

The Xbox implements https://www.opengl.org/registry/specs/NV/vertex_program.txt and https://www.opengl.org/registry/specs/NV/vertex_program1_1.txt This article will mainly focus on actual encoding on hardware as the behaviour is mostly outlined in those GL extensions already.

Registers

There are:

• 12 temporary registers: R0 to R11
• output registers: oPos, oD0, oD1, oFog, oPts, oB0, oB1, oT0, oT1, oT2, oT3, A0.x
• Input data: ???

R12 is a mirror of the output register oPos

Instructions

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